Samsung SyncMaster CSH7839L Service Manual Download Page 28

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7 Troubleshooting

7-2

CSH7839L/CSH9839L

7-1-2 DPMS Failure

Make No H/V sync (power off

mode)

Check signal source

H/V sync video level.

LED blinks

Check IC201 Pin 31.

Yes

+12 V line off

Check IC201 Pin 1.

Check and replace Q655.

Yes

Q654 Base driving voltage exists?

Check IC201 Pin 2.

Check and replace Q654.

Yes

Q659 Gate driving

voltage exists?

Refer to 7-1-1 No Power Supply.

Done

Yes

WAVEFORMS

56.4 V (T601, #7)

CH1 P-P = 56.4 V

CH1 RMS = 9.18 V

Summary of Contents for SyncMaster CSH7839L

Page 1: ...ifications 4 Operating Instructions 5 Disassembly Reassembly 6 Alignment Adjustments 7 Troubleshooting 8 Exploded View Parts List 9 Electrical Parts List 10 Block Diagram 11 PCB Diagrams 12 Wiring Dia...

Page 2: ...Samsung Electronics Co Ltd April 1998 Printed in Korea Code No BH68 61072A...

Page 3: ...ad dress to make certain that the leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the monitor 2 Inspect all protective devices such as nonmetallic con...

Page 4: ...between each blade of the AC plug and accessible conductive parts see above should be greater than 1 megohm 7 Never defeat any of the B voltage interlocks Do not apply AC power to the unit or any of...

Page 5: ...SIZE Horizontal Size H PHONE Headphone Hz Hertz I SENSE Current Sense lb Pound MAX Maximum MIC Microphone MIN Minimum MP C Metalized Polyester MPP Metal Polypropylene MO R Metal Oxide OSC Oscillator...

Page 6: ...ET Field Effect Transistor FH Horizontal Frequency FS Fail Safe FV Vertical Frequency GD Geometric Distortion H V Horizontal Vertical HV High Voltage I O Input Output IC Integrated Circuit LED Light E...

Page 7: ...05 MHz Active Display CSH9839L Horizontal 352 mm 3 mm 4 3 ratio 330 mm 3 mm 5 4 ratio Vertical 264 mm 3 mm CSH7839L Horizontal 306 mm 3 mm 4 3 ratio Vertical 230 mm 3 mm Input Voltage AC 90 to 264 Vol...

Page 8: ...used with coaxial cable for improved signal transmission Better signal transmission becomes critical at high frequencies such as those required for 1280 x 1024 resolution Most video boards that operat...

Page 9: ...IBM VESA MAC Timing 3 3 Timing Chart This section of the service manual describes the timing that the computer industry recognizes as standard for computer generated video signals C D A O E B P Video...

Page 10: ...5 175 Negative Negative Separate 43 269 23 111 1 556 3 810 5 222 17 778 85 008 13 333 0 080 0 427 12 800 0 027 36 000 Negative Negative Separate 53 674 18 631 1 138 2 702 14 222 0 569 85 061 11 756 0...

Page 11: ...8 5 Figure 4 1 Front View and Controls Parallel Button Trapezoid Button Adjustment Button Menu Button Brightness Control Contrast Control 4 5 6 7 8 MENU 1 Power Button Power Indicator LED Dual Color S...

Page 12: ...uter equipped with VESA DPMS functionality If your computer system cannot support a display power management function you can purchase an optional DPMS software program to enable the power saving func...

Page 13: ...the tab outward on the Chassis Bottom and pull the Tilt and Swivel Base up to remove it 5 1 4 Removing the Top Shield 1 Remove the 4 screws on the Top Shield Cover and remove the Shield CSH7839L CSH9...

Page 14: ...deo PCB Assembly Rear Shield and Video PCB 1 Remove the 9 screws on the PCB Assembly 2 Using pinch nosed pliers or long nosed pliers pull both side taps of Video PCB Assembly 3 Lift off the Video PCB...

Page 15: ...ted from static electricity 5 1 11 Removing the Bracket 1 Remove the 10 screws on the Front Cabinet 5 1 12 Removing the Degaussing Coil 1 Using pinch nosed pliers or long nosed pliers carefully push t...

Page 16: ...5 Disassembly and Reassembly 5 4 CSH7839L CSH9839L 5 2 Reassembly Reassembly procedures are in the reverse order of Disassembly procedures...

Page 17: ...85 Hz Display image Full white Contrast Maximum Brightness Maximum 6 1 1 g HIGH VOLTAGE ADJUSTMENT Signal 1024 x 768 mode 68 kHz 85 Hz Display image Full white Contrast Maximum Brightness Maximum Limi...

Page 18: ...above 2 Color analyzer or any luminance measurement equipment 6 1 3 Connecting the SoftJig Connect the monitor to the signal generator and or PC as illustrated in Figures 6 1 and 6 2 Note The signal c...

Page 19: ...he or box next to V_POSI to center the vertical image on the raster 6 2 2 Linearity Linearity affects the symmetry of images as they appear on the screen Unless each row or column of blocks in a cross...

Page 20: ...Frequency 68 kHz 85 Hz Display image Crosshatch pattern Brightness Cut off Contrast Maximum Click on the or box next to PARALL to make the image are rectangular Figure 6 6 Parallelogram 6 2 6 Side Pin...

Page 21: ...oordinate to 0 298 0 02 4 Click on the or box next to R_CUT to set the x coordinate to 0 283 0 02 Note If the above adjustments cannot be done to each coordinate click on the or box next to G_CUT to d...

Page 22: ...is procedure is the same as that for 9300K refer to the procedure on page 6 5 6 4 3 c WHITE BALANCE ADJUSTMENT CONDITIONS Scanning frequency 68 kHz 85 Hz Display image Full white pattern Brightness Cu...

Page 23: ...quency 68 kHz 85 Hz Display image White flat field Luminance Cut off point at the center of the display area Note Color purity adjustments should only be attempted by qualified personnel PROCEDURE For...

Page 24: ...rotate the individual rings change the spacing between tabs to converge the vertical red and blue lines 4 Rotate the pair of rings maintaining the spacing between tabs to converge the horizontal red a...

Page 25: ...cted by external magnetic fields 2 Make sure the static convergence is properly adjusted 3 Strategically place small rubber magnets on the back of the CRT to correct the misconvergence Be careful not...

Page 26: ...n Yoke 6 4 4 a HORIZONTAL LINE RED AND BLUE BALANCE CONVERGENCE Figure 6 17 Horizontal Line Balance Misconvergence Use a 2 5 mm hexkey at the Horizontal Balance Coil XV Turning it right raises the rig...

Page 27: ...deo output circuits High voltage does not develop Horizontal output circuits 7 1 1 No Power Supply Chirping noise exists Check and replace Q659 IC608 and IC607 Check and replace FG601 D601 Done No Yes...

Page 28: ...eo level LED blinks Check IC201 Pin 31 Yes No 12 V line off Check IC201 Pin 1 Check and replace Q655 Yes No Q654 Base driving voltage exists Check IC201 Pin 2 Check and replace Q654 Yes No Q659 Gate d...

Page 29: ...07 and D412 Check DY connector connection No No IC251 Pin 4 is high Replace IC251 Check some parts around Q253 and Q254 Yes No Check some parts around Q252 IC251 Pin 26 waveform is right Check some pa...

Page 30: ...e varies with different H_Lin DAC values IC402 Pin 4 voltage varies with different H_Lin DAC values Check 12 V 14 V line Check some parts around IC402 Check L402 Yes Yes No Check and replace IC201 No...

Page 31: ...eck some parts IC201 Pin 5 IC251 Pin 28 and IC401 Pin 2 No 7 1 8 Side Pin or Trap Failure IC251 Pin 24 output exists Yes Check and replace IC251 Check and replace IC401 Check some parts IC401 Pin 2 an...

Page 32: ...e IC03 No Check tilt connector connection 7 1 11 V Deflection Failure 14 V line is on IC251 Pin 23 output exists Check and replace IC251 Yes Yes No Refer to 7 1 1 No Power Supply No IC301 Pin 1 input...

Page 33: ...g pulse exist Check 24 V line Check and replace Q501 Q253 Q254 IC251 and Q502 Yes Yes No Check and replace R506 and Q502 No Q502 base driving pulse exists Check and replace R504 T501 D502 D503 and Q50...

Page 34: ...terns Check and replace IC01 Input full white pattern to monitor No Yes No T502 Pin 8 output exists Check and replace T502 Yes No IC201 Pin 3 output exists and varies with different patterns Check and...

Page 35: ...Q554 are right Replace failed part Yes Yes No Check IC302 Pin 1 No IC251 Pin 25 output is right Check and replace IC251 Yes No Some parts around Q551 Q552 and Q553 are right Replace failed part No No...

Page 36: ...ns 4 6 and 14 outputs are right Check 12 V line Check and replace IC02 Yes No Cathode DC levels are right Check 220 V line Check and replace Q108 and IC06 No No G2 voltage is right Check G2 wire CRT S...

Page 37: ...7 1 17 Micom Failure IC201 Pin 25 input is right IC201 Pins 32 and 33 inputs are right Check X201 C213 and C214 Yes Yes No Check IC606 No IC201 Pin 40 input is right Check IC202 Yes No All in output v...

Page 38: ...k CN104 Pin 3 Yes Yes No Check and replace Q303 and D304 No IC03 Pins 7 and 8 inputs are right Check IC201 Pins 34 and 35 Yes No IC03 Pins 21 22 and 23 outputs are right Check and replace IC03 No No I...

Page 39: ...rast VR rotation IC201 Pin 14 input varies with brightness VR rotation Check and replace control board Yes Yes No Check and replace control board No IC201 Pins 11 and 12 inputs are right at each funct...

Page 40: ...ase input is right Check and replace Q601 No No Yes Check D Coil Pos 601 Yes IC201 Pin 7 output is right Check and replace IC201 Check user control board Yes No R206 and R603 are right Replace R206 an...

Page 41: ...e Check G2 voltage high voltage R G B cathode voltage Yes No No LED is Amber color No Yes 7 2 2 Shut down Yes 7 2 2 Shut Down Blinking LED s Scan failure Check horizontal vertical deflection system an...

Page 42: ...Are proper AC voltage on all cathodes Refer to 7 1 16 No Video Yes Yes No Check signal generator and cathode No Are proper DC voltage on all cathodes Check IC06 Pins 10 11 and 12 IC01 Pins 24 25 and...

Page 43: ...G2 control volume and FBT No Is blank pedestal on Pins 29 32 and 35 of IC01 Check IC01 and related components Yes No Is V_FLB pulse on Pin 10 of CN105 Check Q303 and CN102 Done Yes No Is blank pedesta...

Page 44: ...re right Check IC05 on Video board Yes Yes No Check Video cable No Signals at CN201 Pin 6 CN204 Pins 2 and 7 are right Check wire dressing and connections Check circuits on Main board IC201 and IC251...

Page 45: ...39L CSH9839L 7 19 Is the convergence now within spec Readjust convergence No Done Yes Is the convergence now within spec Done Change CRT and readjust convergence No Done Yes Try readjusting convergenc...

Page 46: ...and check for focus change Yes Is dynamic focus circuit right Refer to 7 1 15 Dynamic Focus Failure Replace the CRT and verify focus Yes No Adjust focus VR 7 2 7 Poor Focus 7 2 8 Purity Failure Purit...

Page 47: ...8 Exploded View and Parts List 8 1 Front Cover CRT Ass y CSH7839L CSH7839L CSH9839L 8 1...

Page 48: ...8 2 Chassis Stand Ass y CSH7839L 8 Exploded View Parts List 8 2 CSH7839L CSH9839L...

Page 49: ...8 3 Rear Cover Ass y CSH7839L 8 Exploded View Parts List CSH7839L CSH9839L 8 3...

Page 50: ...8 Exploded View Parts List 8 4 CSH7839L CSH9839L 8 4 Front Cover CRT Ass y CSH9839L...

Page 51: ...8 5 Chassis Stand Ass y CSH9839L 8 Exploded View Parts List CSH7839L CSH9839L 8 5...

Page 52: ...8 6 Rear Cover Ass y CSH9839L 8 Exploded View Parts List 8 6 CSH7839L CSH9839L...

Page 53: ...20 50V Y5V 2 3X3 0 C203 76 4 301 7 2202 002009 C CERAMIC MLC AXIAL 100nF 80 20 50V Y5V 2 3X3 0 C204 79 289 4 2201 000326 C CERAMIC DISC 2 2nF 10 50V Y5P 6 3X3 0 5 TP C205 84 3 300 1 2401 000028 T 50V1...

Page 54: ...000053 T 25V10M CAP AL ELEC 106M 1E C407 169 3 213 3 2202 002009 C CERAMIC MLC AXIAL 100nF 80 20 50V Y5V 2 3X3 0 C408 176 8 213 3 2202 002008 C CERAMIC MLC AXIAL 10nF 80 20 50V Y5V 2 3X3 0 C409 160 8...

Page 55: ...227 4 37 2 2202 000561 C CERAMIC MLC RADIAL 680pF 5 50V NPO 5 1x3 2 5 1 T C514 232 4 29 2401 000031 C AL 47uF 20 16V GP 6 3x11mm 5mm T C515 204 3 25 8 2201 000163 C CERAMIC DISC 10nF 80 20 50V Y5V 6...

Page 56: ...E C669 120 4 236 4 2401 000039 T 1000UF 16V 20 R RAD CAP AL ELEC 108M 1C 10x16 C670 13 7 255 2 2401 000042 C AL 100uF 20 16V GP 6 3x7mm 2 5mm C671 7 3 260 2 2202 002008 C CERAMIC MLC AXIAL 10nF 80 20...

Page 57: ...4 0402 000272 DIODE REC UF4001 DO 41 50V 1A 1V 1A 50NS 0 5A D412 240 4 197 3 0402 000445 DIODE REC MUR10150E TO 220 ST02169 205 180 D413 218 4 252 8 0402 000007 DIODE RECTIFIER 1N4937GP 600V 1A DO 41...

Page 58: ...D663 55 179 5 0402 000012 DIODE RECTIFIER UF4007 1KV 1A DO 41 F651 94 2 133 5 3601 001092 FUSE FERRULE 125V 2 5A SLOW BLOW EPOXY 7 1x F652 84 7 191 8 3601 001092 FUSE FERRULE 125V 2 5A SLOW BLOW EPOXY...

Page 59: ...9 8 2701 000154 FIX 220UH 10 4X10 5MM INDUCTOR AXIAL 220UH L504 135 70 1 BH27 20344M COIL CHOKE 3 5MH 10 DR14 20 BULK L601 18 4 62 BH27 20344L COIL LINEFILTER 40MH MIN SQE 3535 BULK L604 110 4 211 3 2...

Page 60: ...1 000067 REF CF 10K 5 1 6W 150V 1300TO 350PPM C R AXIAL R203 79 9 292 4 2001 000051 REF CF 2 7K 5 1 6W 150V 1300TO 350PPM C R AXIAL R204 87 6 294 1 2001 000029 REF CF 100 5 1 6W 150V 1300TO 350PPM C R...

Page 61: ...8 5 279 3 2001 000067 REF CF 10K 5 1 6W 150V 1300TO 350PPM C R AXIAL R262 11 5 296 8 2001 000029 REF CF 100 5 1 6W 150V 1300TO 350PPM C R AXIAL R263 46 3 280 2001 000067 REF CF 10K 5 1 6W 150V 1300TO...

Page 62: ...217 5 290 5 2001 000086 REF CF 100K 5 1 6W 150V 1300TO 350PPM C R AXIAL R440 211 311 2001 000086 REF CF 100K 5 1 6W 150V 1300TO 350PPM C R AXIAL R442 199 8 287 8 2001 000108 REF CF 18K 5 1 6W 150V 13...

Page 63: ...115 2 2001 000086 REF CF 100K 5 1 6W 150V 1300TO 350PPM C R AXIAL R556 135 7 115 2 2001 001138 R CARBON S 390ohm 5 1 2W AA TP 2 4x6 4mm R557 107 8 97 1 2001 001195 R CARBON S 330Kohm 5 1 2W AA TP 2 4...

Page 64: ...L R678 207 8 303 5 2001 000086 REF CF 100K 5 1 6W 150V 1300TO 350PPM C R AXIAL R679 87 5 245 2001 000001 R CARBON 2Kohm 5 1 6W AA TP 1 8x3 2mm R680 50 2 248 2 2001 000108 REF CF 18K 5 1 6W 150V 1300TO...

Page 65: ...DE ZENER UZ6 2BM 6 2V 6 0 6 4V 500mW DO ZD204 54 7 322 3 0403 000007 DIODE ZENER UZ6 2BM 6 2V 6 0 6 4V 500mW DO ZD401 161 9 239 4 0403 000342 DIODE ZENER UZ3 6BSA 3 6V 3 47 3 68V 500mW ZD601 67 2 101...

Page 66: ...122 290 4 80 7 2201 000021 C CERAMIC DISC 100nF 80 20 50V Y5V 8x3 5 TP C124 263 8 181 7 2401 000430 C AL 10uF 20 250V GP 10x16mm 5mm T C125 260 4 113 9 2401 000039 CAP AL ELEC 108M 1C 10x16 T 1000UF 1...

Page 67: ...187 8 43 6 2201 000138 C CERAMIC DISC 100pF 10 50V Y5P 4 0X4 0 2 5 C176 187 7 47 3 2201 000138 C CERAMIC DISC 100pF 10 50V Y5P 4 0X4 0 2 5 C177 187 7 50 9 2202 000344 C CERAMIC MLC RADIAL 10nF 10 50V...

Page 68: ...N101 253 4 16 4 3701 001018 CONNECTOR DSUB 15P 3R FEMALE STRAIGHT AU30 CN102 187 9 114 9 3711 003854 CONNECTOR HEADER BOX 15P 1R 2mm ANGLE SN CN104 134 116 1 3711 003245 CONNECTOR HEADER NOWALL 14P 1R...

Page 69: ...4 211 0401 000005 75V 150MA 1V 10MA DIODE SIG 1N4148 DO 35 DR01 250 4 28 7 0401 000005 75V 150MA 1V 10MA DIODE SIG 1N4148 DO 35 DR02 242 4 26 1 0401 000005 75V 150MA 1V 10MA DIODE SIG 1N4148 DO 35 DR0...

Page 70: ...AA TP 1 8x3 2m R105 254 2 99 2 2001 000059 REF CF 5 6K 5 1 6W 150V 1300 TO 350PPM C R AXIAL R106 246 5 94 6 2001 000097 REF CF 1M 5 1 6W 150V 1300 TO 350PPM C R AXIAL R107 229 9 93 5 2001 000040 R CAR...

Page 71: ...L R163 226 34 2 2001 000868 REF CF 56 5 1 6W 150V 1300 TO 350PPM C R AXIAL R164 223 4 34 2 2001 000868 REF CF 56 5 1 6W 150V 1300 TO 350PPM C R AXIAL R166 286 6 56 4 2001 000041 R CARBON 820ohm 5 1 6W...

Page 72: ...2m RB08 318 3 39 7 2001 000301 REF CF 10 5 1 6W 150V 1300 TO 350PPM C R AXIAL RB09 313 8 34 5 2001 000026 REF CF 75 5 1 6W 150V 1300 TO 350PPM C R AXIAL RB10 309 3 56 4 2001 000029 REF CF 100 5 1 6W...

Page 73: ...62 3 2001 000048 REF CF 2 2K 5 1 6W 150V 1300 TO 350PPM C R AXIAL RR07 259 3 47 4 2001 000056 R CARBON 4 7Kohm 5 1 6W AA TP 1 8x3 2m RR08 252 1 49 6 2001 000301 REF CF 10 5 1 6W 150V 1300 TO 350PPM C...

Page 74: ...4P 1R 2 5MM ANGLE HD01 0401 000005 DIODE SWITCHING 1N4148 75V 300MA DO 35 HIC01 1202 000119 IC VOLTAGE COMP 319 DIP 14P 300MIL DUAL HR01 2001 000056 R CARBON 4 7KOHM 5 1 8W AA TP 1 8X3 2MM HR02 2001 0...

Page 75: ...B CSH7839T1D ELSAT AUSTRIA BH94 30012L ASS Y PCB CSH7839T1D SEMO RUSSIA BH94 30012B ASS Y PCB CSH9839T1D SEN BWT NET HITACHI BH94 30012P ASS Y PCB CSH7839T1D SEN BWT TOSHIBA B D ASS Y CODE BH98 10011K...

Page 76: ...9 Electrical Parts List 9 24 CSH7839L CSH9839L Memo...

Page 77: ...R SOG ERROR DETECT FEED BACK POWER SYNC H SYNC TRIGGER PWM CONTROL SWITCHING FET STR S6719A BNC D SUB INPUT H SYNC V SYNC POWER OFF CONTROL VIDEO OUTPUT VOLTAGE REGULATOR KA78R12 VOLTAGE REGULATOR KA7...

Page 78: ...Memo 10 Block Diagrams 10 2 CSH7839L CSH9839L...

Page 79: ...410 Q411 Q412 Q406 Q501 IC601 IC202 Q659 Q652 QR05 QG05 QB05 Q254 Q401 Q504 Q506 E B C B C E B C E G D S S G D E B C E B C DIODE E C B R A K TYPE NO REF NO PARTS TYPE NO REF NO PARTS LTV 817M SH 24LC2...

Page 80: ...Memo 11 PCB Diagrams 11 2 CSH7839L CSH9839L...

Page 81: ...2 V_FOCUS 1 NC V_OUT V_OUT 1 2 3 GND R_OUT GND G_OUT 1 2 3 4 GND GND B_OUT GND 5 6 7 8 GND V_FLB 9 10 8 V HEATER 11 TILT TILT 1 2 3 NC V_OUT V_OUT 1 2 3 H H V V 1 2 3 4 FBT H H V V 1 2 3 4 GND R_OUT G...

Page 82: ...13 1 CSH7839L CSH9839L 13 Schematic Diagrams 13 1 Power Part Schematic Diagram...

Page 83: ...13 Schematic Diagrams CSH7839L CSH9839L 13 2 1 544 V IC601 1 CH1 P P 544 V CH1 RMS 332 4 V 2 56 4 V T601 7 CH1 P P 56 4 V CH1 RMS 9 18 V...

Page 84: ...13 Schematic Diagrams 13 3 CSH7839L CSH9839L 13 2 Micom H V Process Part Schematic Diagram...

Page 85: ...down 1 478 left 2 478 rignt 3 45 pos 0 539 pin 1 476 menu 2 476 D Sub High BNC Low 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 0 610 Low 0 1 127 3 28 3 121 6...

Page 86: ...13 Schematic Diagrams 13 5 CSH7839L CSH9839L 13 3 Main Part Schematic Diagram...

Page 87: ...0 0 611 3 75 0 11 85 4 46 4 46 11 85 11 85 0 4 96 11 85 4 96 pin MODES 31 kHz 69 kHz 96 kHz Table 13 5 IC501 TL494CN Unit Vrms 8 230 V Q405 S CH1 P P 230 V CH1 RMS 150 1 V 7 10 96 V IC401 6 CH1 P P 1...

Page 88: ...13 Schematic Diagrams 13 7 CSH7839L CSH9839L 13 4 Video Part Schematic Diagram...

Page 89: ...ND GND 2 97 4 84 11 8 0 51 1 08 1 896 0 51 1 08 2 21 0 51 1 08 2 21 11 2 11 2 11 2 GND GND 2 97 4 84 11 8 0 51 1 08 1 896 0 51 1 08 2 21 0 51 1 08 2 21 11 2 11 2 11 2 GND GND 2 97 4 84 11 8 pin MODES...

Page 90: ...13 Schematic Diagrams 13 9 CSH7839L CSH9839L 13 5 CRT Socket Control Part Schematic Diagram...

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